noun
batboy
Baseball term for a boy who assists the team by retrieving bats and equipment on the field. Wasei-eigo from 'ground boy'.
wasei-eigo (Japanese-coined English), from ground boy
彼は高校時代、野球部でグラウンドボーイをしていた。
In high school, he worked as a batboy for the baseball team.
Variant with interpunct; less common but still seen.
バットボーイ is the more common English-derived term for batboy; グラウンドボーイ is a wasei-eigo equivalent used in Japanese baseball contexts.
Wasei-eigo from English 'ground' + 'boy'. The term is specific to Japanese baseball and not used in English-speaking baseball contexts.